31. Air corridors often are shared, but planes traveling in opposite directions are supposed to fly at different altitudes.32. The collision virtually forced the Indian air force to partially open up air corridors over New Delhi skies. 33. Planes are separated vertically by just 1, 000 feet ( 330 meters ) in the same air corridor . 34. To discourage a similar incident this weekend, Cuban authorities plan to ban low-flying craft from international air corridors . 35. Air corridors often are shared, although planes traveling in opposite directions are supposed to fly at different altitudes.36. But China's refusal to let the graceful silver giant float through its air corridors deflated their round-the-world dreams. 37. Some 30 warplanes and airliners may be flying at any time, but using different altitudes and air corridors . 38. Air Corridor operated services to the following domestic scheduled destinations ( at March 2007 ) : Pemba and Quelimane.39. Weeks were lost, for example, negotiating a high-altitude air corridor so diplomats can fly directly between the two capitals. 40. Generally planes are separated vertically by just 1, 000 feet ( 330 meters ) in the same air corridor .
